Seán Lemass, Irish soldier and politician, 4th Taoiseach of Ireland (died 1971)

Seán Francis Lemass was an Irish Fianna Fáil politician who served as Taoiseach and Leader of Fianna Fáil from 1959 to 1966. He also served as Tánaiste from 1957 to 1959, 1951 to 1954 and 1945 to 1948, Minister for Industry and Commerce from 1957 to 1959, 1951 to 1954, 1945 to 1949 and 1932 to 1939 and Minister for Supplies from 1939 to 1945. He served as a Teachta Dála (TD) from 1924 to 1969.

The Taoiseach is the head of government or prime minister of Ireland. The office is appointed by the President of Ireland upon nomination by Dáil Éireann and the office-holder must retain the support of a majority in the Dáil to remain in office.